Overcast skies, rain, and snow and ice affect panel performance during a storm. By design, photovoltaics (PV) still generate electricity under cloudy conditions and even with a thin layer of snow or thin layer of ice. During snow storms, a well-designed installation can recover relatively quickly depending on how much snowfall was received and variations in ambient temperatures. When a portion of a panel is exposed, it generates power and causes the panel to begin to warm. This, plus the panel angles, speed up the process of accumulations gradually or quickly falling.